Update memory.d

version: dmd v2.063-devel 

```
llvm/util/memory.d(38): Error: function memcpy (void* s1, const(void*) s2, ulong n) is not callable using argument types (void[], char*, ulong)
```

There's another bug somewhere, but it might be in dmd since it triggers [This Assert](https://github.com/D-Programming-Language/dmd/blob/master/src/init.c#L660)  in dmd.

...And I just decided to go ahead and update since I couldn't find any bugs...   =(